Key parameters at a glance
- A radius of 2.99 Earth radii
- A mass of 9.22 Earth masses
- Surface gravity around 1.03 g
- An orbital period of 9.946 days
- Semi-major axis 0.0920 AU
- Equilibrium temperature 807 K (534 °C)
- Distance from Earth 3,432.89 light-years
- Earth Similarity Index 0.292
- Travel time at Voyager 1 speed 60,539,007 years
2 siblings around Kepler-255
Kepler-255 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-255 d | Super-Earth | 1.32 | 2.30 | 1.046 | 1,710 | 2016 |
| Kepler-255 b | Super-Earth | 1.55 | 3.02 | 5.715 | 971 | 2014 |
| Kepler-255 c this | Sub-Neptune | 2.99 | 9.22 | 9.946 | 807 | 2014 |
Kepler-255 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#529of 1978
top 26.7%
This planet
2.99R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-255 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.99 | 11.21 |
| Mass (M⊕) | 1.00 | 9.22 | 317.83 |
| Density (g/cm³) | 5.51 | 1.90 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 83.26 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 272083669
Gaia DR2
Gaia DR2 2080202611655694336
Gaia DR3
Gaia DR3 2080202611655694336
System
Kepler-255
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.95 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0920 AU.
Transit Fingerprint
Depth
0.099 %
Duration
3.380 h
Impact parameter b
0.330
Rp / R★
0.028229
Transit midpoint (BJD)
2,455,004.7002
Photometric dip
Transit produces a flux drop of 995 ppm lasting ≈ 3.38 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028229
Semi-major axis / stellar radius
23.070
Impact parameter (b)
0.330
Transit mid-time (BJD)
2,455,004.7002
Angular separation (arcsec)
0.08740
Eq. Temperature
807K
(534 °C)
Insolation (S⊕)
83.26
Earth = 1.00
Earth Similarity (ESI)
0.292
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-255
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,573 K — cooler than the Sun (5,778 K)
Estimated Age
2.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.933 R☉
Stellar Mass
0.867 M☉
Metallicity [Fe/H]
0.34
Extended Stellar Properties
Surface gravity (log g)
4.516 dex
Stellar density
1.500 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.922 mas
Total Proper Motion
16.357 mas/yr
PM Right Ascension
2.10 mas/yr
PM Declination
-16.22 mas/yr
Galactic Cartesian (pc)
x = 0.305 · y = -0.624 · z = 0.719
Equatorial (J2000)
RA 296.06427° · Dec 45.97676°
Galactic ℓ, b
79.407° · 10.754°
Ecliptic λ, β
316.796° · 65.237°
HTM-20 index
-1995035172
Similar Worlds
Kepler-1175 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.99 R⊕ · 3,659.1 ly
HD 213519 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.99 R⊕ · 133.7 ly
Kepler-223 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.99 R⊕ · 6,065.6 ly
HD 191939 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.00 R⊕ · 174.8 ly
Kepler-1667 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.98 R⊕ · 2,044.4 ly
Kepler-985 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.98 R⊕ · 2,215.8 ly